1 /* Print RTL functions for GCC.
2 Copyright (C) 2016-2018 Free Software Foundation, Inc.
3
4 This file is part of GCC.
5
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
9 version.
10
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
19
20 #include "config.h"
21 #include "system.h"
22 #include "coretypes.h"
23 #include "tm.h"
24 #include "rtl.h"
25 #include "alias.h"
26 #include "tree.h"
27 #include "flags.h"
28 #include "predict.h"
29 #include "function.h"
30 #include "basic-block.h"
31 #include "print-rtl.h"
32 #include "langhooks.h"
33 #include "memmodel.h"
34 #include "emit-rtl.h"
35 #include "varasm.h"
36
37 /* Print an "(edge-from)" or "(edge-to)" directive describing E
38 to OUTFILE. */
39
40 static void
print_edge(FILE * outfile,edge e,bool from)41 print_edge (FILE *outfile, edge e, bool from)
42 {
43 fprintf (outfile, " (%s ", from ? "edge-from" : "edge-to");
44 basic_block bb = from ? e->src : e->dest;
45 gcc_assert (bb);
46 switch (bb->index)
47 {
48 case ENTRY_BLOCK:
49 fprintf (outfile, "entry");
50 break;
51 case EXIT_BLOCK:
52 fprintf (outfile, "exit");
53 break;
54 default:
55 fprintf (outfile, "%i", bb->index);
56 break;
57 }
58
59 /* Express edge flags as a string with " | " separator.
60 e.g. (flags "FALLTHRU | DFS_BACK"). */
61 if (e->flags)
62 {
63 fprintf (outfile, " (flags \"");
64 bool seen_flag = false;
65 #define DEF_EDGE_FLAG(NAME,IDX) \
66 do { \
67 if (e->flags & EDGE_##NAME) \
68 { \
69 if (seen_flag) \
70 fprintf (outfile, " | "); \
71 fprintf (outfile, "%s", (#NAME)); \
72 seen_flag = true; \
73 } \
74 } while (0);
75 #include "cfg-flags.def"
76 #undef DEF_EDGE_FLAG
77
78 fprintf (outfile, "\")");
79 }
80
81 fprintf (outfile, ")\n");
82 }
83
84 /* If BB is non-NULL, print the start of a "(block)" directive for it
85 to OUTFILE, otherwise do nothing. */
86
87 static void
begin_any_block(FILE * outfile,basic_block bb)88 begin_any_block (FILE *outfile, basic_block bb)
89 {
90 if (!bb)
91 return;
92
93 edge e;
94 edge_iterator ei;
95
96 fprintf (outfile, " (block %i\n", bb->index);
97 FOR_EACH_EDGE (e, ei, bb->preds)
98 print_edge (outfile, e, true);
99 }
100
101 /* If BB is non-NULL, print the end of a "(block)" directive for it
102 to OUTFILE, otherwise do nothing. */
103
104 static void
end_any_block(FILE * outfile,basic_block bb)105 end_any_block (FILE *outfile, basic_block bb)
106 {
107 if (!bb)
108 return;
109
110 edge e;
111 edge_iterator ei;
112
113 FOR_EACH_EDGE (e, ei, bb->succs)
114 print_edge (outfile, e, false);
115 fprintf (outfile, " ) ;; block %i\n", bb->index);
116 }
117
118 /* Determine if INSN is of a kind that can have a basic block. */
119
120 static bool
can_have_basic_block_p(const rtx_insn * insn)121 can_have_basic_block_p (const rtx_insn *insn)
122 {
123 rtx_code code = GET_CODE (insn);
124 if (code == BARRIER)
125 return false;
126 gcc_assert (GET_RTX_FORMAT (code)[2] == 'B');
127 return true;
128 }
129
130 /* Subroutine of print_param. Write the name of ARG, if any, to OUTFILE. */
131
132 static void
print_any_param_name(FILE * outfile,tree arg)133 print_any_param_name (FILE *outfile, tree arg)
134 {
135 if (DECL_NAME (arg))
136 fprintf (outfile, " \"%s\"", IDENTIFIER_POINTER (DECL_NAME (arg)));
137 }
138
139 /* Print a "(param)" directive for ARG to OUTFILE. */
140
141 static void
print_param(FILE * outfile,rtx_writer & w,tree arg)142 print_param (FILE *outfile, rtx_writer &w, tree arg)
143 {
144 fprintf (outfile, " (param");
145 print_any_param_name (outfile, arg);
146 fprintf (outfile, "\n");
147
148 /* Print the value of DECL_RTL (without lazy-evaluation). */
149 fprintf (outfile, " (DECL_RTL ");
150 w.print_rtx (DECL_RTL_IF_SET (arg));
151 w.finish_directive ();
152
153 /* Print DECL_INCOMING_RTL. */
154 fprintf (outfile, " (DECL_RTL_INCOMING ");
155 w.print_rtx (DECL_INCOMING_RTL (arg));
156 fprintf (outfile, ")");
157
158 w.finish_directive ();
159 }
160
161 /* Write FN to OUTFILE in a form suitable for parsing, with indentation
162 and comments to make the structure easy for a human to grok. Track
163 the basic blocks of insns in the chain, wrapping those that are within
164 blocks within "(block)" directives.
165
166 If COMPACT, then instructions are printed in a compact form:
167 - INSN_UIDs are omitted, except for jumps and CODE_LABELs,
168 - INSN_CODEs are omitted,
169 - register numbers are omitted for hard and virtual regs, and
170 non-virtual pseudos are offset relative to the first such reg, and
171 printed with a '%' sigil e.g. "%0" for (LAST_VIRTUAL_REGISTER + 1),
172 - insn names are prefixed with "c" (e.g. "cinsn", "cnote", etc)
173
174 Example output (with COMPACT==true):
175
176 (function "times_two"
177 (param "i"
178 (DECL_RTL (mem/c:SI (plus:DI (reg/f:DI virtual-stack-vars)
179 (const_int -4)) [1 i+0 S4 A32]))
180 (DECL_RTL_INCOMING (reg:SI di [ i ])))
181 (insn-chain
182 (cnote 1 NOTE_INSN_DELETED)
183 (block 2
184 (edge-from entry (flags "FALLTHRU"))
185 (cnote 4 [bb 2] NOTE_INSN_BASIC_BLOCK)
186 (cinsn 2 (set (mem/c:SI (plus:DI (reg/f:DI virtual-stack-vars)
187 (const_int -4)) [1 i+0 S4 A32])
188 (reg:SI di [ i ])) "t.c":2)
189 (cnote 3 NOTE_INSN_FUNCTION_BEG)
190 (cinsn 6 (set (reg:SI <2>)
191 (mem/c:SI (plus:DI (reg/f:DI virtual-stack-vars)
192 (const_int -4)) [1 i+0 S4 A32])) "t.c":3)
193 (cinsn 7 (parallel [
194 (set (reg:SI <0> [ _2 ])
195 (ashift:SI (reg:SI <2>)
196 (const_int 1)))
197 (clobber (reg:CC flags))
198 ]) "t.c":3
199 (expr_list:REG_EQUAL (ashift:SI (mem/c:SI (plus:DI (reg/f:DI virtual-stack-vars)
200 (const_int -4)) [1 i+0 S4 A32])
201 (const_int 1))))
202 (cinsn 10 (set (reg:SI <1> [ <retval> ])
203 (reg:SI <0> [ _2 ])) "t.c":3)
204 (cinsn 14 (set (reg/i:SI ax)
205 (reg:SI <1> [ <retval> ])) "t.c":4)
206 (cinsn 15 (use (reg/i:SI ax)) "t.c":4)
207 (edge-to exit (flags "FALLTHRU"))
208 ) ;; block 2
209 ) ;; insn-chain
210 (crtl
211 (return_rtx
212 (reg/i:SI ax)
213 ) ;; return_rtx
214 ) ;; crtl
215 ) ;; function "times_two"
216 */
217
218 DEBUG_FUNCTION void
print_rtx_function(FILE * outfile,function * fn,bool compact)219 print_rtx_function (FILE *outfile, function *fn, bool compact)
220 {
221 rtx_reuse_manager r;
222 rtx_writer w (outfile, 0, false, compact, &r);
223
224 /* Support "reuse_rtx" in the dump. */
225 for (rtx_insn *insn = get_insns (); insn; insn = NEXT_INSN (insn))
226 r.preprocess (insn);
227
228 tree fdecl = fn->decl;
229
230 const char *dname = lang_hooks.decl_printable_name (fdecl, 1);
231
232 fprintf (outfile, "(function \"%s\"\n", dname);
233
234 /* Params. */
235 for (tree arg = DECL_ARGUMENTS (fdecl); arg; arg = DECL_CHAIN (arg))
236 print_param (outfile, w, arg);
237
238 /* The instruction chain. */
239 fprintf (outfile, " (insn-chain\n");
240 basic_block curr_bb = NULL;
241 for (rtx_insn *insn = get_insns (); insn; insn = NEXT_INSN (insn))
242 {
243 basic_block insn_bb;
244 if (can_have_basic_block_p (insn))
245 insn_bb = BLOCK_FOR_INSN (insn);
246 else
247 insn_bb = NULL;
248 if (curr_bb != insn_bb)
249 {
250 end_any_block (outfile, curr_bb);
251 curr_bb = insn_bb;
252 begin_any_block (outfile, curr_bb);
253 }
254 w.print_rtl_single_with_indent (insn, curr_bb ? 6 : 4);
255 }
256 end_any_block (outfile, curr_bb);
257 fprintf (outfile, " ) ;; insn-chain\n");
258
259 /* Additional RTL state. */
260 fprintf (outfile, " (crtl\n");
261 fprintf (outfile, " (return_rtx \n");
262 w.print_rtl_single_with_indent (crtl->return_rtx, 6);
263 fprintf (outfile, " ) ;; return_rtx\n");
264 fprintf (outfile, " ) ;; crtl\n");
265
266 fprintf (outfile, ") ;; function \"%s\"\n", dname);
267 }
268